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Michell Instruments Pura User Manual

Advanced online hygrometer
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Pura
Advanced Online Hygrometer
User's Manual
97074 Issue 9
March 2013

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  • Page 1 Pura Advanced Online Hygrometer User’s Manual 97074 Issue 9 March 2013...
  • Page 2 Please fill out the form(s) below for each instrument that has been purchased. Use this information when contacting Michell Instruments for service purposes. Instrument Code Serial Number Invoice Date Location of Instrument Tag No Instrument Code Serial Number Invoice Date...
  • Page 3 © 2013 Michell Instruments This document is the property of Michell Instruments Ltd. and may not be copied or otherwise reproduced, communicated in any way to third parties, nor stored in any Data Processing System without the express written authorization of Michell Instruments Ltd.

  • Page 4: Table Of Contents

    INSTALLATION ....................2 Unpacking the Instrument ................... 2 2.1.1 Unpacking Pura Advanced Online Hygrometer ..........2 2.1.2 Unpacking Pura SEN (transmitter, no block version) ......... 3 2.1.3 Unpacking Pura OEM-single bag, PRM-double bag versions ......4 2.1.4 Unpacking Monitor ..................4 2.1.5...
  • Page 5 Unpacking - Monitor and Pura OEM / PRM ............3 Figure 3 Unpacking - Pura SEN - Transmitter, No Block ..........3 Figure 4 Unpacking - Pura OEM & PRM - Single / Double Bag ........4 Figure 5 Unpacking - Monitor ...................4 Figure 6 Unpacking - Accessories Pack ..............5...

  • Page 6: Safety

    Michell Instruments can offer a variety of re-calibration and exchange transmitter schemes to suit your specific needs. A local representative will be pleased to provide detailed, custom advice.

  • Page 7: Abbreviations

    Pura Advanced Online Hygrometer User’s Manual Abbreviations The following abbreviations are used in this manual: barg bar gauge °C degrees Celsius °F degrees Fahrenheit dew point direct current μm micro-meter lbf-ft pound foot l/min liters per minute milliampere megapascal m/sec...
  • Page 8 Pura Advanced Online Hygrometer User’s Manual This page left intentionally blank viii 97074 Issue 9, March 2013...

  • Page 9: Introduction

    The system comprises a programmable monitor configured to accept a unique Michell data string from the Pura transmitter. The zero and span of the monitor are set to cover the dew-point range -120 to -40°Cdp (-184 to -40°Fdp) at operating pressures up to 24 MPa (240 barg / 3480 psig).

  • Page 10: Installation

    Unpacking the Instrument 2.1.1 Unpacking Pura Advanced Online Hygrometer The Pura Advanced Hygrometer instrument and accessories are packed in a box and the method of unpacking is shown as follows: Unpacking - Monitor and Pura SEN, no block version Figure 1...

  • Page 11: Unpacking Pura Sen (Transmitter, No Block Version)

    Pura Advanced Online Hygrometer User’s Manual INstallatIoN Unpacking - Monitor and Pura OEM / PRM Figure 2 2.1.2 Unpacking Pura SEN (transmitter, no block version) Unpack the dew-point transmitter box as follows: Figure 3 Unpacking - Pura SEN - Transmitter, No Block NOTE: The transmitter sensing element is protected while in transit by a red cover containing a small desiccant capsule.

  • Page 12: Unpacking Pura Oem-Single Bag, Prm-Double Bag Versions

    INstallatIoN 2.1.3 Unpacking Pura OEM-single bag, PRM-double bag versions Figure 4 Unpacking - Pura OEM & PRM - Single / Double Bag 2.1.4 Unpacking Monitor The monitor (2) is packed, together with its fixing clamps (1) as shown below. Unpacking - Monitor...

  • Page 13: Accessories Pack (Pura Sen, Oem, Prm)

    Pura Advanced Online Hygrometer User’s Manual INstallatIoN 2.1.5 Accessories Pack (Pura SEN, OEM, PRM) The accessories pack is shown below: Unpacking - Accessories Pack Figure 6 Pura Advanced Online Components On delivery, please check that all the following standard components are present in the packing box.

  • Page 14: Pura Sen

    NOTE: For environmental and operating conditions, refer to Appendix A, Technical Specifications. NOTE: OEM and PRM version transmitters are protected in transit by putting in a plastic bag filled with nitrogen. Pura OEM transmitter has single bag protection, Pura PRM transmitter has double bag protection. Electrical connector...

  • Page 15: Monitor

    Pura Advanced Online Hygrometer User’s Manual INstallatIoN Monitor The instrument has a 5-digit display, set-up on delivery to display a dew-point temperature range of -120° to -40°Cdp (-40° to -184°Fdp). Dew-point temperature units are displayed by the last LED located to the far right of the display.

  • Page 16: Transmitter Mounting

    Michell Instruments recommends the use of Swagelok retained gasket assemblies, ® containing silver plated, stainless steel 1/2” VCR gaskets, when connecting the Pura into a gas line. NOTE: Do not overtighten or the thread on the pipework may be stripped.

  • Page 17: Sensor Block Connection

    Pura Advanced Online Hygrometer User’s Manual INstallatIoN 2.7.2 Sensor Block Connection The following procedure must be carried out by a qualified installation engineer. To mount the transmitter into the sensor block (preferred method), proceed as follows, refer to Figure 11.

  • Page 18: Pura Oem & Prm Connection

    2.7.3 Pura OEM & PRM Connection The Pura OEM and PRM have been assembled and packaged within a Class 100 clean- room environment. To maintain this level of cleanliness the packaging should only be breached within the same, or cleaner, environment.

  • Page 19: Preparation Of The Cable

    The cable is pre-wired so no user wiring is required. If the cable needs to be re-wired, see below: Cable connection to the Pura transmitter is made via the removable connector. Removing the central screw enables the connector terminal block to be removed from the outer housing by using a small screwdriver to prise it clear.

  • Page 20: Wiring Connection Between The Transmitter And The Monitor

    Pura Advanced Online Hygrometer User’s Manual INstallatIoN 2.8.1 Wiring Connection Between the Transmitter and the Monitor The diagram below shows the identity of the connector terminals. YELLOW Signal A YELLOW GREEN GREEN GREEN Signal B Signal (B) PIN 1 BLUE...

  • Page 21: Mounting The Monitor

    Pura Advanced Online Hygrometer User’s Manual INstallatIoN Mounting the Monitor The monitor is designed for panel mounting and requires a panel cut-out of 46 x 92mm (1.8 x 3.6”). The recommended panel thickness is 2 to 5mm (0.08 to 0.2”).

  • Page 22: Electrical Connections

    Pura Advanced Online Hygrometer User’s Manual INstallatIoN 2.10 Electrical Connections The power supply voltage is indicated on the connection detail label located on the monitor. As the monitor is provided for continuous operation it does not have an ON/ OFF switch.

  • Page 23: Low Voltage Power Supply Input (Optional)

    Pura Advanced Online Hygrometer User’s Manual INstallatIoN 2.10.2 Low Voltage Power Supply Input (Optional) For low voltage powered display • 18 to 36 V AC and 9 to 60 V DC Connect the power supply to the monitor (1) as shown in Figure 17.

  • Page 24: Transmitter Connections

    2.13 Transmitter Installation The effective operation of the Pura Transmitter, in a flowing gas environment, relies on the transmitter being installed directly into the gas stream or by having a fully representative gas sample directed over the sensor measurement surface. Where possible, avoid installing the transmitter in a ‘dead’...

  • Page 25: Operation

    Pura Advanced Online Hygrometer User’s Manual OPERATION OPERATION When the instrument is first powered-up the display may show a zero value for about 1 second, followed by a flashing OPEN approximately 5 seconds, before showing a dew-point value. This is normal and does not indicate a problem with the instrument.

  • Page 26: Selecting The Engineering Units

    Pura Advanced Online Hygrometer User’s Manual OPERATION 3.1.1 Selecting the Engineering Units PROGRAM UNLOCK Enter the mode (Section 3.1). SETUP, While pressing press  once. Release both buttons and keep pressing SETUP until CODE 7 is displayed. The monitor can display dew point in °C (C),°F (F), or ppb / ppm (P).

  • Page 27: Hysteresis, Make/Break Delay & Delay Type

    Pura Advanced Online Hygrometer User’s Manual OPERATION SPC_n, The source of relay setpoints are set by setting digit 2 of i.e. as shown below: Displayed value (DEFAULT) Dew Point only Pressure Open transmitter connection Open / short circuit transmitter Open / short circuit thermistor All transmitter faults For example;...

  • Page 28: Analog Output Scaling

    Pura Advanced Online Hygrometer User’s Manual OPERATION The Make delay time is the time delay between the setpoint being reached and the relay energizing. The Break delay time is the time delay between the relay being energized and it de-energizing. The maximum make and break delay time is 9 hours, 6 minutes, 6 seconds, in increments of 1 second.

  • Page 29: Pressure Compensation

    Pura Advanced Online Hygrometer User’s Manual OPERATION Pressure Compensation PROGRAM UNLOCK Enter the mode (see Section 3.1). The monitor has the ability to measure pressure in order to provide a pressure compensated value for ppm Using a Pressure Transducer In order to enable the use of a pressure transducer set...

  • Page 30: Automatic Pressure Input Calibration

    Pura Advanced Online Hygrometer User’s Manual OPERATION 3.3.2 Automatic Pressure Input Calibration Alternatively, the pressure input can be calibrated using a 4 - 20 mA source. Connect the current source between pin 2 (-ve) and pin 5 (+ve). to 022 and press SETUP .

  • Page 31: Maintenance

    MAINTENANCE Routine maintenance of the Pura Transmitter is confined to regular re-calibration. This work can only be done by exposure of the Pura Transmitter to sample gases of known moisture content. Calibration services traceable to the National Physical Laboratory (UK) and the National Institute of Standards and Technology (USA) are provided by Michell Instruments.
  • Page 32 Pura Advanced Online Hygrometer User’s Manual appendix a Appendix A Technical Specifications 97074 Issue 9, March 2013...

  • Page 33: Appendix A Technical Specifications

    316 cold drawn stainless steel, 0.1 - 0.2 Ra μm Pura SEN- 1/2” VCR female process connection Gas Connection Ports Pura OEM & PRM 2 x 1/4” VCR male process connection Pura PRM & Pura OEM: 120mm between inlet and outlet sealing Installation Profile...

  • Page 34: Figure 21 Pura Sen

    -75 to +20°C dew point traceable to NIST (USA) (For dew points < -90°C: Direct reference to a fundamental chilled mirror dewpointmeter) Environmental Protection IP65 Weight Pura PRM & OEM - 450g (15.8oz) Condition Output Fault Conditions Transmitter fault FAIL...

  • Page 35: Figure 23 Monitor Dimensions

    Pura Advanced Online Hygrometer User’s Manual appendix a 16mm MONITOR (0.6”) 117mm    (4.6”) 42mm 47mm (1.7”) (1.9”) 96mm SIDE VIEW     (3.7”) FRONT VIEW (0.2”) 40mm   (1.6”) 91mm   (3.6”) Pura ...
  • Page 36 Pura Advanced Online Hygrometer User’s Manual appendix B Appendix B Setup Codes 97074 Issue 9, March 2013...

  • Page 37: Appendix B Setup Codes

    Pura Advanced Online Hygrometer User’s Manual appendix B Appendix B Setup Codes Calibration modes for input and output DEFAULT VALUE = 052 Digit 1st digit (left most) 2nd digit 3rd digit Calibration Mode Calibration Function Object for Calibration Calibration functions as...
  • Page 38 Pura Advanced Online Hygrometer User’s Manual appendix B CODE 4 Channel 1 Measurement task, Sampling rate DEFAULT VALUE = 207 Digit 1st digit (left most) 2nd digit 3rd digit Analog Sample Rate Analog Output 1 Source 0 only (No Function)

  • Page 39: Appendix Cec Declaration Of Conformity

    Pura Advanced Online Hygrometer User’s Manual appendix C Appendix C EC Declaration of Conformity Michell Instruments...
  • Page 40 48 Lancaster Way Business Park Ely, Cambridgeshire CB6 3NW. UK. declare under our sole responsibility that the product PURA Premium, PURA OEM and PURA Transmitter to which this declaration relates is in conformity with the following standards or other normative document(s) EN61326-1:2006 Electrical equipment for measurement, control and laboratory use –...
  • Page 41 Pura Advanced Online Hygrometer User’s Manual appendix d Appendix D Quality, Recycling & Warranty Information Michell Instruments...

  • Page 42: Appendix D Quality, Recycling & Warranty Information

    Quality, Recycling & Warranty Information Recycling Policy Michell Instruments is concerned with the protection of the environment. It is our commitment to reduce and eliminate from our operations, wherever possible, the use of substances which may be harmful to the environment. Similarly, we are increasingly using recyclable and/or recycled material in our business and products wherever it is practical to do so.

  • Page 43: Calibration Facilities

    Pura Advanced Online Hygrometer User’s Manual appendix d Calibration Facilities Michell Instruments’ calibration facilities are among the most sophisticated in the world and have been recognized for their excellence. Traceability to the National Physical Laboratory (NPL) UK is achieved through our UKAS Accreditation (Number 0179).
  • Page 44 Pura Advanced Online Hygrometer User’s Manual Appendix E Return Document & Decontamination Declaration 97074 Issue 9, March 2013...

  • Page 45: Appendix E Return Document & Decontamination Declaration

    Has the equipment been cleaned and decontaminated? NOT NECESSARY Michell Instruments will not accept instruments that have been exposed to toxins, radio-activity or bio-hazardous materials. For most applications involving solvents, acidic, basic, flammable or toxic gases a simple purge with dry gas (dew point <-30°C) over 24 hours should be sufficient to decontaminate the unit prior to return.
  • Page 46 http://www.michell.com...

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